JPH0432046A - Device for producing optical information recording carrier - Google Patents

Abstract

PURPOSE:To reduce eccentricity by forming a center jig into a truncated cone having a center hole, vertically moving the center jig along a shaft, energizing it upward by a spring and pressing the inner peripheral surface of a substrate to the slope of the center jig. CONSTITUTION:A center jig 5-3 is formed into a truncated cone having a center hole and can be vertically moved along a shaft 4 and is energized upward by a spring 6, and the inner peripheral surface of a transparent substrate 2 is pressed to the slope of the center jig 5-3. The center jig 5-3 is worked with <=5mum precision, and it is vertically slide till the slope of the center jig is uniformly brought into contact with the center hole of the transparent substrate, and the position of the substrate is horizontally adjusted. Thus, eccentricity of the substrate is reduced to <=20mum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for manufacturing an optical information recording carrier used in an optical information recording medium typified by a laser disk, a disk memory, and the like.

[Prior Art] Digital audio discs and information recording discs are generally provided with pits (signals) and pre-groups (guide grooves) on the surface of the disc, but these disc substrates (hereinafter referred to as optical information recording carriers) As a method of mass producing products (known as
The ultraviolet curable resin, which is still in a fluid state, is applied to the stanbar formed by inverting the wafer, a transparent substrate is pressed onto the ultraviolet curable resin, and ultraviolet rays are irradiated through the transparent substrate to make the ultraviolet curable resin. A method is used in which an optical information recording carrier is produced by curing a resin and having an information pattern transferred to the surface. The contents are JP-A No. 51-140601. It is disclosed in JP-A-53-116105, JP-A-54-130902, JP-A-54-138406, JP-A-55-4793, etc.

[Problems with the Prior Art] The conventional single-piece manufacturing apparatus used in the above-mentioned conventional method will be explained with reference to FIG. The apparatus consists of a stamper 1, a cylindrical center jig 5-1 set so as to be concentric with the information pattern on the surface of the stamper, and a transparent substrate 2. An optical information recording medium with less eccentricity was obtained by fitting the inner diameter of the transparent substrate with the centering jig. An example of this is shown in Japanese Unexamined Patent Publication No. 59-171629.

However, with this method, if there is a gap of about 50 μm between the inner diameter of the transparent substrate and the center jig, the eccentricity will be 100 μm.
The problem was that it became larger than the above. In order to improve this, even if the processing accuracy of the inner diameter of the transparent substrate is increased, the accuracy is currently only around 30 μm, and it is difficult to reduce eccentricity below this level at a practical level. .

In order to solve this problem of eccentricity, a method of using a centering jig with a trapezoidal cross-section was proposed in JP-A-61-2.
11023. However, even with this method, the pressing of the center jig against the transparent substrate is uneven, resulting in the substrate being tilted by 100μ as shown in Figure 2.
There is a tendency for large eccentricity of about m to occur. In addition, when a glass substrate is used as a transparent substrate, the inner diameter of the substrate is usually chamfered to prevent the substrate from breaking due to the occurrence of cracks.
As shown in the figure, there was a problem in that centering using a center jig having a trapezoidal cross-sectional shape was particularly difficult.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and provides a manufacturing apparatus for manufacturing an optical information recording carrier with less eccentricity.

[Means for Solving the Problems] In order to achieve the above object, the present inventors manufactured optical information recording carriers using various methods. It was found that this could be achieved by force by pressing the slope of the biased truncated conical central jig, and the present invention was completed.

That is, the apparatus of the present invention includes a substrate supplying means, an ultraviolet curable resin supplying means, a stamper having an uneven pattern on its surface, a center jig for positioning the substrate concentrically with respect to the stamper, and an ultraviolet curable resin supplying means. In an optical information recording carrier manufacturing apparatus comprising a light source for curing resin, the center jig has a truncated conical shape with a center hole, is mounted on a shaft so as to be movable up and down, and is biased upward by a spring. It is characterized in that the center of the substrate is aligned with the center of the center jig by pressing the inner diameter against the slope of the center jig.

[Example] An embodiment of the present invention will be described below with reference to FIG.

A truncated conical center jig (5-3) is set on the shaft (4), and then a stamper (1) having an information pattern on the surface is placed.
is arranged so as to be concentric with the shaft (4). After that, place the ultraviolet curing resin (3) and transparent substrate (2) on the stamper (1), and insert the spring (6) into the center hole of the transparent substrate.
so as to press the slope of the center jig, which is being pushed upward by the The center jig is machined with an accuracy of 5 μm or less, and is slid vertically until the slope of the center jig evenly contacts the center hole of the transparent substrate, and at the same time
) is adjusted horizontally so that the eccentricity of the substrate can be suppressed to within 20 μm.

[Effects of the Invention] As explained above, the manufacturing apparatus of the present invention has the effect that an optical information recording carrier with less eccentricity can be obtained with good reproducibility.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are explanatory diagrams of a conventional apparatus, and FIG. 4 is an explanatory diagram showing an outline of the apparatus of the present invention. 1... Stamper 12... Transparent substrate 3... Ultraviolet curing resin 4... Shaft, 5-1... Center jig 5-3...
Center jig, 6... spring

Claims (1)

[Claims] Consisting of a substrate supply means, an ultraviolet curable resin supply means, a stamper having a concavo-convex pattern on its surface, a center jig for positioning the substrate concentrically with respect to the stamper, and a light source for curing the ultraviolet curable resin. In the optical information recording carrier manufacturing apparatus, the center jig has a truncated conical shape with a center hole and is mounted on a shaft so that it can move up and down and is biased upward by a spring, and the inner diameter of the substrate is aligned with the slope of the center jig. 1. An apparatus for manufacturing an optical information recording carrier, characterized in that the center of the substrate is aligned with the center of a centering jig by being pressed.